Drug interactions
Donepezil transdermal + Perphenazine
Severity: Moderate
Donepezil transdermal and Perphenazine: moderate interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Donepezil increases cholinergic activity and can worsen or provoke extrapyramidal symptoms, while perphenazine's dopamine blockade and anticholinergic properties may counteract the cognitive benefit of donepezil. The combination can therefore reduce the effectiveness of one or both drugs.
What this interaction means in plain words
Donepezil transdermal and Perphenazine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Why it happens
Pharmacodynamic antagonism between cholinesterase inhibition and dopamine blockade with anticholinergic activity.
What to do
Monitor cognition and for new or worsening parkinsonism or tremor. Consider a lower-anticholinergic antipsychotic if effects emerge.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Perphenazine
- Ibutilide + Perphenazine Contraindicated
- Perphenazine + Pimozide Contraindicated
- Perphenazine + Thioridazine Contraindicated
- Adagrasib + Perphenazine Major
- Alfentanil + Perphenazine Major
- Amiodarone + Perphenazine Major
Frequently asked questions
Can I take Donepezil transdermal with Perphenazine?
MediHelp rates the interaction as moderate. Donepezil transdermal and Perphenazine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Donepezil increases cholinergic activity and can worsen or provoke extrapyramidal symptoms, while perphenazine's dopamine blockade and anticholinergic properties may counteract the cognitive benefit of donepezil. The combination can therefore reduce the effectiveness of one or both drugs.
How serious is the interaction between Donepezil transdermal and Perphenazine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor cognition and for new or worsening parkinsonism or tremor. Consider a lower-anticholinergic antipsychotic if effects emerge.
What other medicines interact with Perphenazine?
MediHelp also lists interactions of Perphenazine with, for example, Ibutilide, Pimozide, Thioridazine. The full list is on the Perphenazine page.
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